As part of an ongoing Roll Call political webinar series, our editors took a detailed look at upcoming House and Senate primaries. From the heated Democratic primary in Northern Virginia to questions of Republican conservatism up and down the ballot, the group gabbed about the races that ultimately will determine the makeup of the next Congress. Check out the video for some highlights from the conversation.

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Watch the full webinar, which was sponsored by Comcast NBCUniversal, here .